10.9 is no more

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1732353002

Review URL: https://codereview.chromium.org/1732353002

PRESUBMIT.py

@@ -42,7 +42,7 @@ GOLD_TRYBOT_URL = ('https://gold.skia.org/search2?unt=true'
 # Path to CQ bots feature is described in https://bug.skia.org/4364
 PATH_PREFIX_TO_EXTRA_TRYBOTS = {
     # pylint: disable=line-too-long
-    'cmake/': 'client.skia.compile:Build-Mac10.9-Clang-x86_64-Release-CMake-Trybot,Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot',
+    'cmake/': 'client.skia.compile:Build-Mac-Clang-x86_64-Release-CMake-Trybot,Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot',
     # pylint: disable=line-too-long
     'src/opts/': 'client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot',